Debt (Medium-Term Notes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-term Debt, Weighted Average Interest Rate	3.69%
Medium-term Notes	$ 2,692.6	$ 2,089.5
Debt Mark To Market Adjustment	(3.1)	(11.8)
Effect Of Interest Rate Swaps Change In Interest Expense	14.8	13.9	$ 13.6
Repayments of Other Debt	0.0	465.2	0.0
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	12.9	18.5
Proceeds from Issuance of Long-term Debt	594.6	841.8	0.0
Losses on Extinguishment of Debt	0.0	$ (33.2)	$ 0.0
2.00% Senior Notes Due 2015 [Member]
Senior notes rate		2.00%
Repayments of Other Debt		$ 251.9
Debt Instrument, Maturity Date		Jun. 15, 2015
Repayment of Other Debt, Face Amount		$ 250.0
Premium Paid Due To Early Redemption Of Debt		1.9
Losses on Extinguishment of Debt		$ 2.3
10.60% senior notes due 2019 [Member]
Senior notes rate		10.60%
Repayments of Other Debt		$ 28.1
Debt Instrument, Maturity Date		Apr. 15, 2019
Repayment of Other Debt, Face Amount		$ 20.7
Premium Paid Due To Early Redemption Of Debt		7.4
Losses on Extinguishment of Debt		7.7
2.05% Senior Notes Due 2017 [Member]
Medium-term Notes	350.0	350.0
6.25% senior notes due 2018 [Member]
Medium-term Notes	250.0	250.0
Cash received, interest rate swap		$ 18.7
Senior notes rate		6.25%
Debt Instrument, Maturity Date		Apr. 15, 2018
Debt Instrument, Face Amount		$ 250.0
2.15% 2018 Note and 3.90% 2025 Note [Member]
Proceeds from Issuance of Long-term Debt	594.6
Debt Instrument, Face Amount	600.0
2.15% senior notes due 2018 [Member]
Medium-term Notes	$ 300.0	0.0
Senior notes rate	2.15%
Debt Instrument, Maturity Date	Oct. 15, 2018
Debt Instrument, Face Amount	$ 300.0
2.875% 2019 Note and 4.00% 2024 Note [Member]
Proceeds from Issuance of Long-term Debt		841.8
Debt Instrument, Face Amount		850.0
2.875% senior notes due 2019 [Member]
Medium-term Notes	350.0	$ 350.0
Senior notes rate		2.88%
Debt Instrument, Maturity Date		Dec. 01, 2019
Debt Instrument, Face Amount		$ 350.0
4.70% senior notes due 2020 [Member]
Medium-term Notes	381.3	$ 381.3
Senior notes rate		4.70%
Repayments of Other Debt		$ 184.7
Debt Instrument, Maturity Date		Aug. 15, 2020
Repayment of Other Debt, Face Amount		$ 168.7
Debt Instrument, Face Amount		550.0
Premium Paid Due To Early Redemption Of Debt		16.0
Losses on Extinguishment of Debt		23.2
4.00% Senior Notes Due 2022 [Member]
Medium-term Notes	250.0	250.0
4.00% Senior Notes Due 2024 [Member]
Medium-term Notes	$ 500.0	$ 500.0
Senior notes rate		4.00%
Debt Instrument, Maturity Date	Dec. 01, 2024	Dec. 01, 2024
Debt Instrument, Face Amount	$ 500.0
3.90% Senior Notes Due 2025 [Member]
Medium-term Notes	$ 300.0	$ 0.0
Senior notes rate	3.90%
Debt Instrument, Maturity Date	Oct. 15, 2025
Debt Instrument, Face Amount	$ 300.0
6.11% senior notes due 2028 [Member]
Medium-term Notes	1.5	1.5
Interest Rate Swap [Member]
Debt Instrument, Face Amount	$ 596.0
Interest Rate Swap [Member] \| 4.70% senior notes due 2020 [Member]
Cash paid, interest rate swap		5.9
Repayments of Debt		154.0
Debt Instrument, Face Amount		346.0
Interest Rate Swap [Member] \| 4.00% Senior Notes Due 2024 [Member]
Debt Instrument, Face Amount		$ 250.0

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Cash received, interest rate swap

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of long-term debt outstanding.

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Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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